Well my flight attendant stood over me until I took DS out of the ergo, he was sound asleep and it was landing time... I said, he will cry and she said no he wont, he is asleep, and literally stood over me quite roodly, until I put the seatbelt on him. So you know what happened then, he proceeded to wail at the top of his lungs for the remainder of the flight... But the ergo was perfect for flight time, as he was able to sleep and I could move about with him, so having him on my lap was no problem.

Oh, DS was 8mo at the time... Good luck.